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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15720dfc82f4b641e146538c44e9d35b3ad2c3ae38415afb9b7cf04eef936c07' 
  AND token = 'LCq5lICivF5WHeY3O1UlH07cLTjiUS/iZvz7Vc4juyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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