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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4c12d53894c38a0587abd6ca57ca5cf8fbf83a51e3b4a9393fb86f348201d9' 
  AND token = 'bGpvnGvxFY98SuKYybV2XtpudLhRRH1SRhC+15D0FMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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