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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5bd4a556752c3ae5a0855cd22554a549ce2565ee82758960dc72e620a59967' 
  AND token = 'kVRDs2PrwJCcR3j/cvdaTjXZtrMDgm/q30GlssUNjEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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