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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8eb562afe9512f276ae62db97394bcf4449ef3469de3273bacf3ca9e756423a' 
  AND token = '7viijQoKZ++F0pNTcBcQehId1lpEGoz5VM0dtt/u848=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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