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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b377691c19a22b56e6a1bb79b0e6a6c6e47f00780e29e59ac19a1705ed7a844d' 
  AND token = '6TRwVJRD4Vd30nkoR2s3Arr3XbiJxSESrSwze/6MfI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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