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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa5b338f5288cdd5fd66724761dd11eb320ae9b0f38ab41a0cc4f4621a06b95' 
  AND token = 'L0DN1kp/w8m+lbWq8x4F9BD9WbJDEbRSqSuu2eNrXFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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