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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2814f684d2e6e949d195108200926f35b12ba090a46e80bb5d1fcba82445a26d' 
  AND token = '/MOEgvhluXWnyrFTrCCV5mAuxwGqjbSa4JyGlUXIk74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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