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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8b9ab006849d997d4a7a8056ee44b6d78ee051cdb2e1a21a80551a9dda0ff7' 
  AND token = 'vuLcNXZX7ujYoF1x2dLaOmv88PCrc2WXuC/grydicXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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