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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4852c2e12b3493bd632015375bc92d4e63d75e7f0b0871b034bfcfd4e0af6d' 
  AND token = '5RxpqcG/JMkaaFCalP9pf6+dD1nsInoAzpqgPXSpXhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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