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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ea538d13be221585ce57a5426a832afcb69d0f0fe0813184a720fd7e4c0b11' 
  AND token = 'VPBp8y0whiNh/66bD+LZHi3h6iqr+k+suCnzcI/Ew4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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