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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229612c93dcb9d7742a3a2250546bdab5a8fe7c6fae5ecbfb21173d1f07e4c5a' 
  AND token = 'P+rLkYfr5v5Q6di+5wyQ8ZXdb2OjyYtdHWyAiUuRKiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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