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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15e0e69b957da9a87a8563a0cd32fc9e4aa57583a8514f6b03a2b51318b32eb' 
  AND token = 'x4Zw6AC8+5FCBsWD+DZ/3GZsl2em5qXT6tSMFUpaB48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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