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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262af56bc6c2766aa5624b8e8e6ee924da43b92192c8ec628dfafcfe451953fd' 
  AND token = 'WexdBzKLMceIIe3nLUnwHRyY7x36itqy4ycyeMg7eQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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