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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b702c88d98045b4c5d530edc75c6594d63add7393028833974e7532a380356' 
  AND token = 'qguo4vAu/p4fJfL9xP82pKAe7mJKnM6wzDqwRAqTSTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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