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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d34ebf52449a5d9d39b6fe5f07a5e27aa99f23c6b6e0b381a1347333ba4c60a' 
  AND token = 'c9KXtSnyndhEKZHF7tNkWnu/WLCC/1s1jQtzWeubGyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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