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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b70b2c0f451f20fac3ecfb77c4e88d5bab9d0acdaa2234c6520d987ae4bbcb' 
  AND token = '7BvzuOgAT6CVtGSPgTOkHlRRNgedsrSRY5okslInM3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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