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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f2e6c89e1b1021b564a1c663521baba3794dbde4f9ea2c814f87d0074d8e66' 
  AND token = '7WIujh3G4/8kAeW/q8q83WIDiet3Ujrqe2xuiKdv118=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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