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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfcf4fba0fe4b3aba74228dd07710f207aeee13ca4fb2b21a11d5dc43fea4e7' 
  AND token = 'hNr62m5ak7mz08zoQU83i/S6zdua1GfEfaQ6ZpfhOzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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