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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797685f7d2cb0952087a284051b7c76cb853d069cdf6be5427ab67feb87ba412' 
  AND token = '7S4OdrcainXA6Okac1vbduub5sMJKl/i+iRbPzGdvPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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