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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0594f27765faf9f4860c66acc2a2e8c63099d5751721fa022d8e704fc1852b63' 
  AND token = 'qj5559iNZtWuP1sSyRs+EqsaMawtOMKvlnecKHww4OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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