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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7199b36d0b2173225593a0e4de63e274ff63ad67f4ce30a7a3c90ddda36d458b' 
  AND token = 'FJzD4rgayPh8vM6MZp9zMCo4u20+raxsWbbIud/M1H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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