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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7d95d8edba8b122d0b0874d3d8771d6f2d769f0eb4dccd69bde0d604108d87' 
  AND token = 'UvbbToRfqt6o6unnGFDjOTiah+lGj+Pf9LLwXrVEvc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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