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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd891fe6257ca27779c769442984377e6ba1a42a26c8ac92efb62ee4836d4b0c5' 
  AND token = '6AoJ7wavwKqcMYdrdFwAJI8oHB5FLL5KdacR6yWT/f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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