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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0403b2db3d67fd2a6d5548d95ba82a5987e2872dec872c61a13001ea15947fe' 
  AND token = '7PU0J8+RNb7yM5NFJdD+dFVMwoOGeq2UOccV0Skd0aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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