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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872eeb74e4b538f691f1138c940c2028bc51c69f89dcaab1b27733ec33489b95' 
  AND token = '24RR5LYT45caJhNTgIZuopx8NZ2tDFFP32OfOfoVcLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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