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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3d1be24c21159fd0e98db922719bd099dd84aa76597bdd4e75bcac48acd3b2' 
  AND token = '4MsAk/JxcwbfbKsa5g4+MnQux3rrr0F7gE0Anbg7PGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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