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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a1f6485789f219b05185f88530d6c0f0d23687b7ab860169942c25b04a050e' 
  AND token = 'QoOLzudjX2xMVOfa7dAniMlaQK7az/8iuFAwpgZ7gQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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