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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13007896c0d97c6f9a7c22efbdec4a050f1b60329d2d1e0e8d121fd503f1a492' 
  AND token = 'bHd78XasXP3dKucQ2T4cYZJJvTjZJu3f2iYSYUFYduM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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