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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58e5244696f5fe735f6c4fee3152b5014c0819810105e7c52c355137b1f56e7' 
  AND token = 'h6lmr0ZqpcQBulMBUaC9Wt3rTQP6fcok09vV+est+x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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