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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869bb61f5f1d5bdfe3c6af1ee2e4a18b69df3f2d20574ff7d48105bbaed4fcc5' 
  AND token = 'OH2x1XWdZJD70cTT4Lajk0uXGRzgzFvrKiPCflCvXVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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