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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac5b999f10d3740b84e1c9ddd34af4c473cfea2bd512284785faf7df775c444' 
  AND token = 'EYC04Fjm1z4XeDv26V//Lut5SUeQcMEqP95pTVpaHfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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