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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f9d4a975d85b5ffb068184084c5c555a05652e0e2b14e3096afa8653abacdc' 
  AND token = 'LRSqpkBjNJNcb/CgYZyre5m/CytZ15mDX2b59Y5c3K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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