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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3948fb4b4a6f9754d138122d4d58f6084067af9750919d39ade214c963d695b' 
  AND token = 'Mz+QSepe66CYy8tpzWef85UefbGv44idxT9q1rx4Y4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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