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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaead1394c3fc754fa47820ff7972e20027c3ecca5113032ec5785e92f5ba1eb' 
  AND token = 'VpZI8FDqFMAA4g/AduX7CS6FX6C/5Y6O0zSCNyoPv9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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