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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684a853e3ff0b1f2546a67bdba86ef88cca9794da1261f061158d1e045414537' 
  AND token = 'HBXBM2rDpOcai4MdoqNpSOEf13jal+NDicYlaROBLWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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