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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ba031055d60e5cedb313c8f1ec86857bcba7563bf95a1482833a822c09b6f5' 
  AND token = 'hLVjCjzcRpnY2RC/wYUCEecKnBoa3KL554DogUEIy70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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