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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f5864b0c1a20ac8dc43b807b9aba8b8cbc51a3a8153b6a61258db1a102aa6c' 
  AND token = 'Zp0vvScp9O8xd8/+EovTw6GeS5ncSNVeXGLleo3rTVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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