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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c9cad3116a476bc0b273faca46a0e426566d2d7b6177592fe780c83565c27c' 
  AND token = 'O8eL0JnTPfxcgcnpD6TydPaDaF9XwlQxGpg42S0Gv1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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