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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bbd644820f1decb95b93d3488763b06d503f0db627b675cfcb7706f6f229ae' 
  AND token = 'h10NgBAi1tf5kp/1MRc8h1PwS77Qr/G1bffHjV9Ggoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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