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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869750da8c8e852334f94946a3e0f548c06841ac0219013361d277dd095b006d' 
  AND token = '37v3oQoC4bSUFsHiCe2rU7+PRNjHpGqEfu0F5SbIVHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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