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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58197ef2b5eb9990728c8290c443d4cdef8ddc5e5906b5d05c56ce1245a88d0e' 
  AND token = '3LdEc8NaR4mtYdVPZYs5ERJwZa10kL35GCGCW2Tqf8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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