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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8fc5b45ba9e018ec6e2070fd7987a4a2d210eace259d30318ee5f7b664d0e7' 
  AND token = 'zpERjR6NMgBCkQfGFirYPWt3/VtsBuT6lYG81NaUDJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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