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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b08110fead576f491966100c7b0e53bd6e9f3fbacbb1c45bd155474bf940c9' 
  AND token = '/1Qoocivl1d34UvWpR74tg6SBm8cMk5lUyCXRoCA6Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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