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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bf84433b58f2da9a22723346641d0cc31ccb41cae352cfa72a2d6d54d89eb9' 
  AND token = 'O7HK5czdamETe4quaAGYwVM3ZGGtRGthasbWq/mLbwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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