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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c531b6e37f70a21deddc42b4f4b14da4a3095eee3e883c6e15b445021cca694' 
  AND token = 'wPipLGbc8o69DW2KhIif8ehm3Q2wG4sKflnRy+KI8J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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