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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840aafc2a44dcb631c3a48db2cf7f33d99a5cae0dec659ef8ce1d62222ea791a' 
  AND token = 'NIejqF2s2UOpqib+FmR4Fy0ODa3+FHZaKkpZzlP+0Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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