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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbbf6688a0b14720927d13994e2bc1a60dbcb9a4ad31ac73b835992768730b8' 
  AND token = 'b2ohDRfoMyE5+iqMH45lnNUB3bzrA3bP6wkPya1epIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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