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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b70472f66d71b5c31b1eda1ddcdf5506d0a03e003463e59fb6873aa76226b7c' 
  AND token = 'ntWWLUQj52CPFSCBQ+5dEb0STrnuoQ+X741Rbnh4bwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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