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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedb0bc9edcdfa6fec83992edf575b02d89ecb3b0332b917a3f9a8617a561a46' 
  AND token = 'BGyeAoP3BqQQqT5ZUMdGfB8AFI/Ic5CUemD5KwAS3VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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