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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9560591b99e692e170e8ed0d09a82db15d3c15fcb5697e3d59b127ca0f459c9d' 
  AND token = '7IAfgZ1oFDDGy41ZU3Sx+fmJTHSAkpH56DfVwKEhmcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}