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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f2b778bd76ee0c0bc14239668caa0375a0a1e79c86fe981a76ba6d7870ec70' 
  AND token = 'yYRsxjNApvldev87/6TciAI6u1WowO9hYV+J7IacSl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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