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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e112c7fd48d5d3f87277af4ff8a6c20089a2f02680d96eb6dbdb8e211c55f7' 
  AND token = '7Fo3mTPNAK0iumF3tYdhakasgP84viBaljMQKdhEEs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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