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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a607f6b6e645f0d061fb612019ea3bab6dc8fbfc8c5c1df61bffed1d37aa4116' 
  AND token = 'BYfs4xvQzWa/ckUOL0Ue7HQURciO7Pb9+BLBQNzVBYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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