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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff026c8cdcde192711728a5e088e8e9a6261c5611c1d4c4043094b64b4ff19f0' 
  AND token = 'v67xLQrEJLF2rv/2eAtUfv43SuPSu4notScYKjorcng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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