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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d856d58bb2f7bde364944ebb98b1213be31fee4e3a7be8d00165dbddc2926d6' 
  AND token = 'XcPo03RIZ+LnGj1hTuf+WuSObjvENqFTVu15ZfWl4x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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